Dynamic nuclear polarization in silicon microparticles

被引：66

作者：

Dementyev, A. E. ^{[1
]}

Cory, D. G. ^{[2
]}

Ramanathan, C. ^{[2
]}

机构：

[1] MIT, Francis Bitter Natl Magnet Lab, Cambridge, MA 02139 USA

[2] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.100.127601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report record high Si-29 spin polarization obtained using dynamic nuclear polarization in microcrystalline silicon powder. Unpaired electrons in this silicon powder are due to dangling bonds in the amorphous region of this intrinsically heterogeneous sample. Si-29 nuclei in the amorphous region become polarized by forced electron-nuclear spin flips driven by off-resonant microwave radiation while nuclei in the crystalline region are polarized by spin diffusion across crystalline boundaries. Hyperpolarized silicon microparticles have long T-1 relaxation times and could be used as tracers for magnetic resonance imaging.

引用

页数：4

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